fix: correct syntax error from suggestion application

The individual line suggestions created invalid Python when applied
separately. Combined the ternary expression properly.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

main.py

@@ -943,9 +943,11 @@ async def list_chats(chat_type: str = None, limit: int = 20) -> str:
             unread_count = getattr(dialog, "unread_count", 0) or 0
             # Also check unread_mark (manual "mark as unread" flag)
             inner_dialog = getattr(dialog, "dialog", None)
-            unread_mark = bool(
-                getattr(inner_dialog, "unread_mark", False))
-                if inner_dialog else False
+            unread_mark = (
+                bool(getattr(inner_dialog, "unread_mark", False))
+                if inner_dialog
+                else False
+            )
 
             if unread_count > 0:
                 chat_info += f", Unread: {unread_count}"